[riot-notifications] [RIOT-OS/RIOT] examples: add TCP echo server & client from documentation (#16739)

Leandro Lanzieri notifications at github.com
Thu Sep 23 20:34:20 CEST 2021

@leandrolanzieri commented on this pull request.

> +USEMODULE += netdev_default
+USEMODULE += shell
+USEMODULE += shell_commands
+USEMODULE += netutils
+ifeq (1, $(LWIP))
+  USEMODULE += ipv6_addr
+  USEMODULE += lwip_ipv6_autoconfig
+  USEMODULE += lwip_netdev
+  USEMODULE += auto_init_gnrc_netif
+  USEMODULE += gnrc_ipv6_default
+  # we want to be able to open two sockets

> > I think you also need to activate the module config `CONFIG_KCONFIG_USEMODULE_GNRC_TCP=y`, but Kconfig will complain if something goes wrong (that's the advantage of Kconfig instead of just using CFLAGS ;-))
> I mean to actually make the build system use the app.config file. It just being present doesn't make the build system pick it up.

My configuration file:
When placed as `app.config` it was applied to the end-configuration in `autoconf.h` (maybe try cleaning first).

The better option would be in the Makefile:
ifeq (1, $(LWIP))
  USEMODULE += ipv6_addr
  USEMODULE += lwip_ipv6_autoconfig
  USEMODULE += lwip_netdev
  USEMODULE += auto_init_gnrc_netif
  USEMODULE += gnrc_ipv6_default
  KCONFIG_ADD_CONFIG += app.gnrc.config

This alone would always run Kconfig, as there is an `.config` file in the app directory. To avoid this, add the following to the Makefile:
# As there is a .config we want to explicitly disable Kconfig by setting
# the variable to empty

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